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MIG gas regulator setting

Most regulators come "pre set" to something..
but nobody says what it should be?

I'm not talking about flow rate.
Yes, I do understand the concept of choked flow.

I can get the proper flow rate with either lower pressure (10 psi)
or higher pressure (80 psi), but it seems like the higher the pressure,
the more the first blast of gas when trigger is pulled.
Is that good, or just wasting gas?

Not sure I fully understand and bear in mind that I am not a pro, but I have two gauges on my mig, one for the pressure in the tank (which has no adjustment) and one for the flow rate. The flow rate is in cubic feet per hour and I usually set mine in the range of 18-20 cfh. This is with the trigger pulled.

Jim is not asking about the flow rate. There is flow and pressure. I have a high pressure and low flow fixed regulator to run my air lockers in my jeep. It does .5 cfm at 100psi. Jim wants to know what pressure, in psi, that a regulator flows at a given cfm. I'd have to look but I think my Radnor flow meter is at 50psi output. Not sure though.